<template>
    <div>
           <!-- 面包屑导航 -->
           <el-breadcrumb separator-class="el-icon-arrow-right">
              <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
              <el-breadcrumb-item>商品管理</el-breadcrumb-item>
              <el-breadcrumb-item>商品分类</el-breadcrumb-item>
           </el-breadcrumb>


           <!-- 卡片视图区 -->
           <el-card>
               <!-- 第一行添加分类按钮 -->
               <el-row>
                   <el-col><el-button type="primary" @click="showAddCateDialog">添加分类</el-button></el-col>
               </el-row>
               <!-- 表格 -->
               <tree-table :data="catelist"
                           :columns="columns"
                           :selection-type="false"
                           :expand-type="false"
                           :show-index="true"
                           index-text="#"
                           border
                           style="margin-top: 15px">
                           <!-- 是否有效的模板 -->
                           <template v-slot:isok="scope">
                              <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen"></i>
                              <i class="el-icon-error" v-else style="color: red"></i>
                           </template>
                           <!-- 排序的模板 -->
                           <template v-slot:order="scope">
                              <!-- 1 -->
                              <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
                              <!-- 2 -->
                              <el-tag type="success" size="mini" v-else-if="scope.row.cat_level === 1">二级</el-tag>
                              <!-- 3 -->
                              <el-tag type="warning" size="mini" v-else>三级</el-tag>
                           </template>
                           <!-- 操作模板 -->
                           <template v-slot:opt="scope">
                              <el-button type="primary" icon="el-icon-edit" size="small" @click="edit(scope.row)">编辑</el-button>
                              <el-button type="danger" icon="el-icon-delete" size="small">删除</el-button>
                           </template>

               </tree-table>
               <!-- 分页区 -->
               <el-pagination
                 @size-change="handleSizeChange"
                 @current-change="handleCurrentChange"
                 :current-page="queryInfo.pagenum"
                 :page-sizes="[3, 10, 15, 20]"
                 :page-size="queryInfo.pagesize"
                 layout="total, sizes, prev, pager, next, jumper"
                 :total="total">
               </el-pagination>
           </el-card>
           <!-- 添加分类按钮的对话框 -->
           <el-dialog
               title="添加分类"
               :visible.sync="addCateDialogVisible"
               width="50%"
               @close="addCateDialogClosed">
               <!-- 添加分类表单 -->
              <el-form 
               ref="addCateFormRef" 
               :model="addCateForm" 
               :rules="addCateFormRules"
               label-width="100px">
                <el-form-item label="分类名称:" prop="cat_name">
                  <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类:">
                  <!-- 级联选择框 -->
                   <el-cascader
                    v-model="selectedKeys"
                    :options="parentCateList"
                    :props="cascaderProps"
                    @change="parentCateChanged"
                    clearable
                    change-on-select
                    style="width: 100%">
                    </el-cascader>
                </el-form-item>
              </el-form>
              <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
              </span>
            </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
        // 商品数据列表
          catelist: [],
        //   查询条件
          queryInfo:{
              type: 3,
              pagenum: 1,
              pagesize: 5
          },
          total: 0,
          columns:[
          {
            label: '分类名称',
            prop: 'cat_name'
          },
          {
            label: '是否有效',
            type: 'template',
            template: 'isok'
          },
          {
            label: '排序',
            type: 'template',
            template: 'order'
          },
          {
            label: '操作',
            type: 'template',
            template: 'opt'
          }
          ],
          // 对话框可见属性
          addCateDialogVisible: false,
          // 添加分类数据对象
          addCateForm: {
            cat_name: '',
            // 父级分类id
            cat_pid: 0,
            // 分类等级，默认一级
            cat_level: 0
          },
          parentCateList:[],
          cascaderProps: {
            expandTrigger: 'hover',
            value: 'cat_id',
            label: 'cat_name',
            children: 'children'
          },
          selectedKeys: [],

          // 校验规则
          addCateFormRules:{
            cat_name: [
                     { required: true, message: '请输入分类名', trigger: 'blur' }
            ],
            cat_pid: [

            ],
            cat_level: [

            ]
          }
        }
    },
    created(){
      this.getCateList()
    },
    methods:{
       async getCateList(){
         const {data:res} = await this.$http.get('categories',{ params: this.queryInfo })
         if(res.meta.status != 200) return this.$message.error('获取商品列表失败')
        //  console.log(res.data);
        //  把获取得数据列表给data中的catelist赋值
         this.catelist = res.data.result;
         this.total = res.data.total
       },
      //  监听pagesize改变
      handleSizeChange(newSize){
        this.queryInfo.pagesize = newSize
        this.getCateList();
      },
      // 监听pagenum的改变
      handleCurrentChange(newPage){
        this.queryInfo.pagenum = newPage
        this.getCateList();
      },
      // 添加分类按钮事件
      showAddCateDialog(){
        // 获取父级分类的数据列表
        this.getParentCateList();
        // 展示对话框
         this.addCateDialogVisible = true;
         
      },
      async getParentCateList(){
        const {data:res} = await this.$http.get('categories',{params: {type: 2}})
        if(res.meta.status != 200) return this.$message.error('获取数据失败')
        this.parentCateList = res.data
      },
      // 选择项发生变化
      parentCateChanged(){
        if(this.selectedKeys.length > 0){
          this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
          this.addCateForm.cat_level = this.selectedKeys.length
        }else{
          this.addCateForm.cat_pid = 0;
          this.addCateForm.cat_level = 0;
        }
      },
      // 点击按钮添加新分类
       addCate(){
        this.$refs.addCateFormRef.validate(async valid => {
          if(!valid) return
          const {data:res} = await this.$http.post('categories',this.addCateForm)
          if(res.meta.status != 201) return this.$message.error('添加分类失败')
          this.$message.success('添加分类成功')
          this.getCateList()
          this.addCateDialogVisible = false
        })
      },
      // 对话框关闭时重置表单
      addCateDialogClosed(){
        // 重置表单
        this.$refs.addCateFormRef.resetFields();
        this.selectedKeys = [];
        this.addCateForm.cat_level = 0;
        this.addCateForm.cat_pid = 0;
      }
    }
}
</script>

<style lang="less" scoped>

</style>